I received a short message from the bank this morning: I enjoyed a 30-day interest-free period on 12, 13, and deducted it on 10, 12. What does this mean?

Do you use the easy financial card of Shanghai Pudong Development Bank? E-finance card can be used as a credit card to some extent, but its other interest-free period is fixed at 30 days. So if you use a credit card to spend money, it means overdraft, and the money will be drawn from your card after 30 days. It should be noted that some expenses are only given a two-day interest-free overdraft period, such as building materials and utilities.